Hi all, posted this in the HaxePunk forums but I am posting here to possibly get extra insight.
I’m having a hard time figuring this out, I really wish there was an official tutorial for developing for multiple screen sizes but this is what I want to do. I want to use the zoomEven scale method for my game, taken from Corona SDK’s documentation:
The letterbox method is outdated and no longer accepted by Apple. The second method works for me when I code in Corona because I use fairly hi res assets and I’m not too picky about a slight bit of upscaling or downscaling. I just need to be able to add something to my startup code so I can develop my game for one screen size, and it will scale it up or down, and center it accordingly (in portrait or landscape).
Any help would be very appreciated! 
Thanks!